Set up an import (or import/export) business. This involves some paperwork (more or less depending on what state you incorporate in) both in terms of incorporating the business and in acquiring a license to import. The import of certain goods --such as agricultural products or live goods--requires special licensing at both the federal and state level.
Research what products you are planning to import from South Korea. Iron and steel, chemicals, textiles, semiconductors, ships and automobiles are South Korea's main exports. Foodstuffs, toys and other manufactured goods are also exported in significant quantities.
Establish a letter of credit at a commercial bank. This involves either having significant funds on deposit at the bank or providing collateral equivalent to the amount of the letter of credit. These funds can be used to pay the company in South Korea from which you are buying the products.
Order the South Korean products you are planning on importing. Then confirm the shipping and receipt of the goods through U.S. Customs. If you are importing heavy or bulky items and shipping by transport containers at sea, it can take up to two weeks to receive your products.